Fluid filtering apparatus with removable filter holder



Jan. 19, 1960 M. FORMAN ETAL 2,921,686

FLUID FILTERING APPARATUS WITH REMOVABLE FILTER HOLDER Filed D60. 3;1956 3 Sheets-Sheet 1 MIL ro/v 'Foe/ /A N INVENTORS.

How/m0 D. URDA/VOFF ATTORNE).

Jan. 19, 1960 M. FORMAN ETAL 2,921,686

FLUID FILTERING APPARATUS WITH REMOVABLE FILTER HOLDER Filed Dec. 3,1956 3 Sheets-Sheet 2 Mu. TOA/ F A INVENTORS.

How/4 0 D. URD F J/MAQEAF A TTORNEY.

Jan. 19, 1960 M. FORMAN EIAL 2,921,686

FLUID FILTERING APPARATUS WITH REMOVABLE FILTER HOLDER 3 Sheets-Sheet 3Filed Dec. 3, 1956 M/LTON F R INVENTORS. How/4 0 D. U/ ANOFF AND ATTORNE Y.

United States Patent FLUID FILTERING APPARATUS WITH REMOV- ABLE FILTERHOLDER Milton Forman, New York, N.Y., and Howard D. Ur-

danoif, North Bergen, NJ., assignors to Alpha Tank Company, Inc., LongIsland City, N. a corporation 'of New York Application December 3, 1956,Serial No. 625,684

15 Claims. (Cl. 210323) This invention relates to filters for use in thefiltering of fluids. More particularly it is concerned with readilyremovable and interchangeable holders for filter cartridges and forprovisions for mounting the same in filter shells.

Heretofore the common practice in the manufacture of filters havingtank-like shells or bodies with filter cartridges therein has been tofabricate the tank or shell for the reception of one particular typeorsize of cartridge. The cartridges have generally been mountedindividually in some specially formed member secured within the shell sothat it has been necessary to remove the cartridges individually fromsuch member and either clean, or replace, them or replace them withothers while they were being cleaned. Where removable mountings for thefilter cartridges per se have been provided, the constructions involvedhave been complicated providing such things as members in the form ofheaders for engaging both ends of the cartridges, while the filtershells were specially formed to receive and clamp the headers tightly inposition within the shells. The necessary inclusion of these and otherlimiting features of the prior art constructions have precluded any realflexibility in filter operations and have made those operationsunnecessarily expensive from the standpoints of both equipment andlabor.

The instant invention'eliminates the foregoing and other drawbacks ofprior art constructions and carries the art of filtering a substantialstep forward. It does so by providing a simple and interchangeableholder for filter cartridges, by the provision of simple cooperativemeans between such holder and the filter shell for effectively seatingthe holder therein, and by utilizing inherent characteristics such asthe weight of the holder and cartridge asssembly and the force providedby the pressure on the fluid within the filter shell for maintaining theholder in fixed liquid-tight position in the shell. Thus the holder andcartridge assembly merely needs to be lowered into place in the shell,when being installed, and lifted out therefrom for cleaning andreplacement. No clamping or securing means is employed.

A holder and cartridge assembly can be removed andimmediately replacedby another. Also, the cartridges are merely secured in the holder at oneend and are, at all times, free at the other end.

It is, accordingly, an object of the invention to simplify theinterchangeable mounting of filter cartridges within filter shells.

Another object is to render such mounting fully effective withoutemploying extraneous clamping or securing means.

Still another object is to provide readily removable and replaceablefilter cartridge holders for filtering devlces.

A further object is to provide such holders on which filter cartridgesof diiferent sizes and arrangement may be mounted.

A- still further object is to reduce the labor involved 2,921,686Patented Jan. "19, 19 60 'ice tion of the invention, taken inconjunction with the 3C? companying drawing proceeds.

In that drawing: Fig. 1 is a perspective elevational view of a filtershell in accordance with the invention, with a part of that shell brokenaway to show the interior thereof.

Fig. 1a is a fragmentary plan view of a slightly modified portion offilter shell construction.

Fig. 2 is a top plan view of the shell of Fig. 1, again with a partbroken away to show the interior.

Fig. 3 is an elevation of a filter holder and cartridge assembly inaccordance with the invention with parts broken away to show theinterior thereof and with a fragment of the filtershell shown indot-dash outline to illus trate the mounting of the assembly in theshell.

Fig. 4 is a top plan view of the assembly of Fig. 3.

Fig. 5 is an enlarged sectional view of the holder of the invention asshown in Fig. 3 with fragments of filter cartridges and the handling rodapplied thereto.

Fig. 6 is a similar view illustrating the application of another type ofcartridge to the holder; and

Fig. 7 is a similar view illustrating the application of anothercartridge.

The filter shell of the invention, which is made in accordance with theA.S.M.E. code for pressure filters, has a generally cylindrical body 1with a fixed bottom 2 and removable cover 3. The securement of the cover3 is suitable for withstanding the pressure of the liquid when thefilter is operating. Such securing as here illustrated involves theclamping of the gasket 4 between a ring 5 secured around the mouth ofthe body 1 and ring 6 secured around the open end of the cover 3.Preferably the gasket 4 is positioned in a recess formed in the uppersurface of the ring 5 leaving a portion of the gasket protruding fromthat upper surface for engagement with the under surface of the ring 6.

The actual clamping, as here shown, is efiected by means of the seriesof clamping bolts 7 winch are pivoted at 8 between pairs of leaves 9secured to the body. These bolts when swung inward are receivablebetween pairs of receiving cars 10 extending out from the ring 6 of thecover. The bolts 7 carry nuts 11 and washers 12 therebeneath. Thewashers 12 seat across the upper surfaces of the receiving ears 10.Tightening of the nuts 11 tightens the seating of the washers and servesto secure the head 3 in desired leak and pressure proof position on thebody.

The bottom 2 of the shell is domed concavely downwardly and is providedat its lowermost center portion with the outlet or drain pipe 13 forthe'filtrate. This pipe may, if desired, have a drain plug 14 secured atthe mid-position of its side wall adjacent the outlet end 15. Removal of.the plug 14 enables a portion of the filtrate in the pipe to be drawnoff to the side, rather than letting all of it pass out through theoutlet end 15.

The shell is also provided with a false bottom 16, here shown as securedat 17 to the wall or" the bottom 2 just within the mouth thereof. Thebottom 2, in turn, is suitably welded, or otherwise secured, at 18within the lower end of the cylindrical body 1.

The false bottom 16 is preferably in the form of a flat plate having alarge center opening 19 communicating with the chamber below it providedby the bottom 2. The false bottom 16 is also preferably provided with anopening 20 adjacent the edge thereof, which opening communicates withthe interior of a pipe 21. The pipe 21 passes out through the wall ofthe bottom 2 and terminates in a removable drain plug 22. Thus from timeto time a 3 dirty oil and any sediment contained therein which fails topass through the filters can be drawn ofi through the pipe 21; Positiveassurance against any of such dirty oil and sediment getting into theopening 19 can be achieved by snrroundingfthat opening with ;a shortupstanding collar. Such collar, shown at 23 in Fig. 1a,isw eldejd tothe'false bottom 16 and isfo'rm'ed'with a bore 24"having the'samediameter and axially aligned with the bore'19 in the false bottom16.

An inlet conduit 25 is secured to. the cylindrical side wall 1 atapproximately the midpoint thereof. 'It, of course, communicates withtheinterior of the body to int roduce thereinto the fluid under pressure tobe filtered. Provision is madeon the interior of the body 1, borderingthe'open'ing for the conduit 25, for the removable mount ing of a bafileto distribute the flow of fluid and prevent it'from'strilcing any of thecartridges directly. As here shown, that provision is effected by meansof channel 7 forming members 26 and 27 which mount the bafiie 28.

This bafile is here shown as a triangular plate formed with extremities29 slidably received from above in the channels provided by the members26 and 27.

As is apparent from the Fig. 3 showing, the holder for the filtercartridges could not be lowered into placein the shell if the baffie 28were in position. .Furthermore, if the pattern of the filter cartridgesdid not leave roo'nifor the bafile to protrude in over the cartridgeholder, then one of the cartridges would have to be'removed. Thesefactors are taken care of, however, by the removable mounting V of thebafile and the forming of the pattern of the cartridges mounted on theholder. Thus before theholder and cartridge assembly is lowered'into theshell, the baffie'is removed, then the assembly is properly rotatablyaligned in the shell by locating means, hereinafter described, andcarried on the holder widen the shell. Once the holder is seated inplace in the shell, the bathe can be replaced by merely sliding it downinto position. Conversely, the baflle would be'removed prior to theremoval of the holder and cartridge assembly from the shell.

" Pressure gages 31 and 32 are provided, with the gage 311 communicatingwith and indicatingthe pressure within the body 1, which would betheinlet pressure, whilethe gage 32 communicates with the bottom 2belowthe plate 16 and so indicates the outlet pressure. Thus, thedifferential pressure developed between the compartment with in the body1 above the'plate 16 and thechamber in the bottom '2 below the plate 16can be readily determined. Suitably formed mounting legs 33 arepositioned at spaced points about the periphery of the shell and aresuitably secured thereto to support the shell in desired position.

7 In Figs. 3, 4 and 5, is illustrated a removable filter'cartridgeholder, the assembly of the same with one type of cartridge, and thereception of that assembly within the filter shell. The holder,generally indicated at 35, is a shallow drumlike member having circulartop and bottom plates 36 and 37 respectively, and with anfannular'spacing and bordering Wall 33 therearound. As here shown,

the top and bottom plates 36 'and 37 are secured to the upper and loweredges of the sidewall 38 by' suitable welds 39 and 40 Alternately,however, the side wall 38 and either the top or bottom 36 and 37 couldbe formed integrally, such as by pressing them out of a single'piece ofmaterial, leaving only one the circular plates tobe welded in place.Also, of course, other types of sealed joints could be employed in placeof the joints39 and 4t or securing means other than welding could beemployed for thesecuring of the elements of the holder together.

. V The principal thing to be kept in mind, however, is that the chamber41 within the holder needs tobe liquid tight Q-and must be isolated fromthe around in the shell. I a v m-Eor properly locating the holder 3 5,and{t he pattern of vthe filter cartridges in the shell,withrespeettoTtheposi- ;tion -ofthe1baffle 2 8, the side wall-38 of theholdefiis'pro- .videdu th cutw r lrsr nsiii sau q h fir Thi liquid to befiltered flowing shown in the form of an upwardly extending V, but theydo not meet at their upper end. Rather they are spaced apartsufficiently to enable them to slide down either side of the verticalguide bar 43 provided on the side of the.

cylindrical wall 1. Referring now to Fig. 4, it will be seen that theguide bars 42 are positioned at one of the four places on the holder aswill be apparent from the Fig. 4 showing where the cartridges are setback far enough to enable the baffle 23 to protrude in over the top ofthe holderwhen it is slid into place after the filter assembly ismounted in the shell. Preferably then pairs of guide bars '42 arepositioned on the side wall of the holder at each of the four positionswhere there is room for the I Only one pair is shown, however, forpurposes of illustration. i 5

As already pointed out, the guide bars 42 incline towards each other inthe form of a V. This enables them to be initially located over theguide bar 43. The fact that they do not meet at their top, however, butrather leave room for the guide bar 43 to'slide therethrough, is ofimportance, for otherwise they might limit the extent to which theholder 35 could seat down towards the false bottom 16. p

The top plate 36 is formed for the reception of the desired filtercartridges and the handling rod used in handling the assembly. Suchrod-45 is preferably permanently secured to the plate 36 at itsmidpoint. As here shown, this is done by passing the rod through theplate 36 at 46 and securing it thereto by suitably opposed nuts 47 and48. Then these nuts may be locked in place by fillet welds between theirborders and the surfaces of the plate as shown. Obviously, othersuitable means can'be employed for effectively securing the rod 45 tothe plate 36, it being merely necessary to keep in mind that thesecuring must be fully effective and must remain so since the handlingof the holder and the assembly, both in and out of the shell, iseffected by engaging the loop 49 at the upper end of the rod 45 bysuitable handling means. This is more than just an ordinary handlemember, for with the holder formed to seat in the bottom of the shell,the filter cartridges are carried solely by the plate 36 extendingupwardly from it. 'Hence the assembly of holder and cartridges can bemanipulated both'in and out of the shell and mounted for cleaning andfor removal and replacement of the filter cartridges all by engagementof suitable handling devices with the loop 49.

- The top plate 36 is also formed with a plurality o screw threadedopenings 50 therein, which openings are formed in a pattern to enablethe desired number of cartridges to bemounted on the plate, asillustrated in'Figs. 3 and 4. In this particular showing, the cartridgesare of small diameter and have their own headers and nipplelike mountingmembers, with a mounting rod extending therebetween. The headers 51 arefixedly secured to the mounting rods 52 and are equipped Withsuitablewrenching projections so that the rods can be turned by'the turning ofthe headers from the outside. This is necessary since, in this instance,the cylindrical filter walls 53 of the cartridges are mounted betweenthe undersurfaces of the headers 51 and the channels provided thereforin the upper surfaces of the mounting nipples 54. This mounting of thecartridge cylinders between their end members must be a tight leakprookone. This is eifected by the threading of the lower ends of the rods 52into the hubs of receiving spiders 55 provided therefor in the nipples54. These spiders provide passage for the filtered fluid down past thehub and out through the lower end of the nipples 54 which are formedwith center bores for that purposes.

The nipples 54 are externally screw threaded at 56 forthreaded'reception in the openings 56 inthe plate 36. Thus the internalbores of the nipples communicate through the plate 36 with thechamberlof themounting member 35. Furthermore, since all ofthe' openings.59 are ruin d. w t filter ca r e b r n pple wrest;

54,; the only liquid which can enter the chamber 41 is thefilteredliquid passing through the filter walls of the cartridges. r V

v The filtered liquid passes out from the chamber 41 through theoutletconduit 57 which is secured at its upper end in. the openingprovided therefor in the plate 37 and communicates at that end with thechamber 41 and at its other end with the chamber within the bottom 2.below the false bottom 16. Before going further into that aspect of theinvention, it is to be noted that the sole mounting and positioning ofthe filter cartridges in this instance is by means of the threading oftheir nipples 54 in the openings 50 in the plate 36. The tops of thecartridges merely have their own individual headers and are free fromengagement by any part within the filter shell. 1

gThe conduit v57 .is formed with a conical outer surface 58 at itsbottom end to facilitate its introduction into the opening 19 in theplate 16. 'Such introduction is efiected by merely loweringit into placetherein. The outside diameter of the conduit 57 and the diameter of theopening 19 are so related, as to provide a sliding fit. There must,however, be no possibilityof a leakage path existing between the conduit57 and the opening 19 particularly at this end ofthe shell, for this iswhere the dirty liquid being filtered will be present and such liquidmust be kept separate from .the filtrate. To assure against suchleakagethen a suitable gasket 59 is mounted on the conduit 57 andisbacked up by an annular plate 60 welded to the undersurface of thebottom plate 37 of the filter holder 35. Hence, when the holder 35 ispositioned in the shell with the conduit 57 protruding through theopening 19, in the plate 16, the whole weight of the holder and ,filtercartridges, will rest on the gasket 59 compressing it and givingassurance that a tight joint is formed. Further compression of thegasket 59 and further assurance against leakage is provided by thepressure on the liquid to be filtered within the shell. This pr essureacting on the holder and cartridges, pushes the holder down making surethat the gasket is further compressed and-that the joint is tight.

Instead of seating on the flat surface of the false bottom 16, thegasket 59 may seat on the upper end of the collar 23, as illustratedinFig. la. This collar is made wide enough for eflective'seating of the,gasket and, in

' fact, may have its upper end face inclined inwardly or otherwiseformed to trap the gasket and cause it to flow in tightly against theconduit 57 as it is compressed. In any event, the. forces tending tocompress the gasket would be the same as where the gasket engages thefiat surface 16.

The holder 35 in Fig.6 is, in all principal respects, the same as thatin Fig.5, so. the same reference characters are applied to the commonparts and repetition of the description of those parts is not necessary.The top plate 61 of the Fig; 6 holder differs somewhatfrom itscounterpart, inasmuch-as the filter cartridges 62 of Fig. 6 are of muchgreater diameter than those shownat 53 in Figs. 3, 4 and 5. Accordingly,the screw threaded openings 63 in the plate. 61 willneed to be furtherapart than the openings 50in the plate 36, are larger and are formed ina different pattern to provide for the mounting of the desired number-ofthe cartridges.

in this instance the means for mounting the filter cartridges on theholder also serves as .the means for transmitting the filtrate to thechamber 41. In other words, in'steadof being held in place by rods, thecartridges 62 are held by pipes 64 which are screw threaded at the lowerends 65 -for'reception in the threaded holes 63. These pipes areperforated at spaced positions along their length, as shown at 66, sothat the fluid filtered by the'filter wall of the cartridge will passinto the pipe 64 and down it into the chamber 41. On their upper endsthese pipes protrude above the actual filter walls and are provided withsuitable means for closing them and i for maintaining the cartridges inplace.

As an example, in the Fig. 6 showing, a plug 67 is screwed into theupper end of the pipe 64 to close that end. Beneath its head the plug 67engages a spring 68 which surrounds the protruding part of the pipe 64and engages a gasket 69 at its other end. This gasket seats on the upperend of the filter element 62 and thus holds the cartridge down againstthe gasket 70 which is positioned between the lower end of the cartridgeand the upper surface of the holder wall 61.

Another filter pattern is illustrated in Fig. 7 where, again, the holder35 is the same as those previously described, with the exception of thetop plate thereof. The top plate 71, in this instance, is provided witha greater number of perforations 72 than in the plate 61, but a lessernumber than that of the Fig. 5 showing.

Actually, as seen in Fig. 4, the arrangement of Figs. 3-5

provides for the mounting of 60 cartridges, that of Fig. 6 for themounting of 16 cartridges, while that of Fig. 7 enables the mounting of30 cartridges in the Fig. 6 manner, the cartridges being of smallerdiameter. Thus the cartridge filters 73 in Fig. 7 are each mounted onthe top plate 71 by means of pipes 74 having spaced perforations 75extending through the walls thereof. Again, these pipes not only serveas holders, but they also serve to transmit the filtered fluid down intothe chamber 41. Also each of the cartridge filters here is held in placeon its pipe 74 by suitable means which also closes the upper end of thepipe as illustrated in Fig. 6.

It is believed to be apparent from the foregoing that the structure ofthe invention accomplishes the objects thereof as set forth at theoutset and also introduces additional improvements into the art. Thepurchasers of filters in accordance with the invention merely needstohave on hand holders, such as shown at 35, in a sufiicient smallnumber required to meet his requirements. In other words, if he is usingall the same type of cartridge, he merely needs one spare holderequipped with cartridges,so that when he removes one assembly from thefilter shell he has another one all ready to insert in place of it.Furthermore, that removal merely calls for freeing and removing the topof the shell and lifting the holder and assembly out by engaging theloop member 49. Similarly, the replacement is just lowered in placeuntil the conduit 57 engages with the opening 19, or the openings 19 and24 as the case may be, which is all the holding and positioning of theassembly within the filter shell that is needed. The assembly that hasbeen removed for cleaning and repair can, contrary to any assembly foundin the prior art, be readily handled and worked on, since it can beeither hung from the loop 49 or placed across supports with sufiicientspace for the conduit 57 to extend downwardly.

If the user wishes to be in a position to change from one type of filtercartridge to another, he merely needs to have on hand the necessaryholders for carrying such different cartridges. In some instances, byplugging certain of the holes in the top plate of the holder he can usethe same holder for different cartridges. When a new cartridges comes onthe market, calling for a different. pattern, he merely needs to obtaina suitable holder for it and continues using his existing filter shell.These holders are simple, economical members involving only a minorinitial cost and they are continuously saving substantial sums ingreater utilization of the filter and reduction of labor costs formaintenance and repair.

Though particular structures and relationships of parts for the carryingout of the invention have been shown in the foregoing and illustrated inthe accompanying drawing, it is of course to be understood that such arefor illustrative and/not for limiting purposes. Changes in the structureset forth and other embodiments of the invention will suggest themselvesto those skilled in the' artand'may be'rnade withoutjdepartin'gfront-thespirit andscope of the invention.

Having described our invention what we clai n as new and desire tosecure by Letters Patent n1} 1.:n'1 fluid' filter construction, aremovable filter 'cartridge and'holder assembly for ready insertion intoand removal from a filter shell which comprises, a

holder in the form of a shallow drum having-opposed top and bottomplates and a peripheral joining plate joining said top and bottom platestogether in' spaced relation to form 'ajfiuid tight. chambentherewithin;an

ing means for said cartridgesyl t a a 2. In fluid filter construction, aremovable filtercartridgeand holder assembly for ready insertion intoand removal from a filter' shell whichcomp'rises', a holder the form ofa shallow drum having oppos'ed resend bottom plates and a peripheraljoining plate joining said top and bottom platestogether in spacedrelation to form afiuid tight chamber therewithin, an outlet conduit ex-'tending downwardly from said bottom plate and formed with atpassage'therethrough in communication with said chamber, said top platebeingforme d with a plurality of perforations therethrough, a pluralityof hollow filter cartridgeaoneoverlying each of said-per forations andextending upwardly from said plate and enemas 5. In fluid filterconstruction, a filter shell formed with a topfside 'wall' an ottofn, afiil'*b6 M s'aid' filter" "shell" extending acr'oss the s anie aridsecured in leak-proof relation with respect to the sa de'wall a'ndinupwardly spaced position;with respectto said botmm to 'form' a,chambergtherebetween; said' false bottom being provided with afirstcentrally:positiohedjperfora tion' therethrough communicating"'wit'h isaid' chamber; said falsebottom being formed-withia'second?perforation therethrough spaced from saidffirstperforation-and a conduit communicatingwith 'said second perforation,said conduit extending through said chamber, andout-i wardly through thetwallfof said 'bottom toprovide'for the draining of residue from abovefsaid false bottom. '6. in fluid filter construction formed for theready-re moval' and replacement of filter cartridges which "comprises afilter shell formed with a sidewall, top andbot tom, a 'false' bottomsecure'diri said" filter shell in upwardly spaced relation with respecttosa'id'bottom; said false bottom beingdormed with a perforationtherethrough, and a removable holder for filter cartridges imountedwithin said' shell on'said false bottom; said holderbeing in the formvof'a'receptacle 'withspaced"top and bottom; walls and a side walljsaidbottom fwall'bein'g'forin'ed with a perforation"therethr;ough"inalignment withjthe perforation in said false bottom and a conduitbordering means engaged in said perforationsfor mounting said 7cartridges in said upwardly extending position, said mounting meansincluding conduit means for passing filtrate into said chamber. a v 3.'In fluid filter construction, a removable cartridge and holder:assembly for ready insertion into and removal from a filter shell whichcomprises, a holder in theform of a shallow drum having opposedto p andbottom plates and a peripheral joining plate joining said top and bottomplates together in spaced lrelation to form a fluid tight chambertherewithin, anoutlet conduit extending downwardly from said bottomplate and formed witha passage therethrough in communication with saidchamber, said top plate being formed with a: plurality of r perforationstherethrough, a plurality of hollow filter cartridges, one overlyingeach of said perforations and extending upwardly from said plate,nipplesengaged in;said perforations, and formed for the passage ofltrate therethrough, means on said nipple s for receiving one end ofsaid cartridges and mounting rods secured on one end in saidnipples andextending to the other end of said cartridges for mounting said c ar-'t'ridges in place on said'nipples. a

.LIn fluid filter construction, a removable cartridge 7 and holderassembly for ready insertion into and removal from a 'filter shell whichcomprises, a holder in 'the form of a shallow drum having opposed topand bottom plates and aperipheral joining plate joining said topandbottom plates together in spaced relation-to form a fluid tight chambertherewithin, an outlet conduit extending downwardly .from saidbottomfplate and with said chamber, said top plate beingformed with aplurality of perforations thereth rough, a plurality of hol- 'lowvfilter cartridges, one overlying each, of said perforaformed with apassage therethrough in-communication said opening in said"botto'rn'wall' and" co'rtn'nur'iicatin'g with said opening said'falsebottonijsaidconduit serv ing' to mount said holder on said falsegbotto'mif; '7.- Construction as in'claim"6'whereinsaid conduitiscarried by said bottom wall,'lis slidafbly receivable infsaidperforation in' said false' bottotn'and serves as 'the sole meansfor'mounting said holder withinls'aidshell." J "8. Construction as in1aim"6 wherein there is gasket means between 'said bottom wall andsaidlfalsebottom, said gasket means surroundingsiaid"conduit andprevent-. ing leakage between said conduit and said perforation. 9;Construction as inclaim 6 wherein thre'is' a collar formed on said'falsebottom surrounding said perforation and extending upwardly around the"same'fsaidfcollar're ceiving said conduit. I

10. Construction as in claim 9 wherein there is compressible gasketmeans between the'upper'endof said'colla'r'and the'un'derside' of s'aidbottomjvalli T j 11; Constructionas' in claim 16"wlieiein said top wallis formed with perforationstherethrough for the'moune ing of filtercartridges thereon and'a pluralityof filter cartridges is mounted 'onsaid top wall." f l 12. In fluid filter construction formed for theready removal" and replacement of filter cartridges which i'com prises,a filter shell formed with a. side wall, top'and bottom, a supportcarried by saidv bottom for mounting am ter holder within's'aidshelladjacent said bottom jsaid support including a collan'having anbpening-there within said shell, said holder fbe iiig iri the' ford-loare tceptacle' with V spaced top" and bottom walls and aside wall, said'bottonrwall being formed with a perforation therethrough inalignmehtwith' the opening in'said collar and a conduit bordering 'said openingin'saidbottom'@vall and communicatingwith s aidopening in said collar,said conduit serving to mount said "holder saidXiollari 13, Fluid filterconstruction jas in claim' IZwherein said conduit is carried by saidjbottom wall, is slidabl'y receivable in said collar 'and"serves". asthe'sole means for mounting said holder within said shell. 1'

714; Fluid. filter construction-{as in claim Band including 'gasketmeans between said bottomiwalha'iid the upper surface of said collar,said: gasket*nieans-surround+ ing said conduit being compressed; by theweight of said filter holder'and preventing leakage between said conduitand the opening in saidcollara Y f l5. Fluid filter construction as inclaim l 4lwherein said top wallof said removable-holder-is formed withperforations therethrough refine mounting brine: can

tridges thereon and a plurality of filter cartridges mounted on saidwall.

References Cited in the file of this patent UNITED STATES PATENTS WayJune 26, 1888 Jones Feb. 9, 1892 Chamberland Apr. 12, 1898 Barr 31,Elliot Feb. 22, 1916 10 Norquist et a1. Apr. 25, 1933 Malanowski Nov.10, 1942 Briggs et a1. May 1, 1945 Rayburn Apr. 27, 1948 Shepard Apr.10, 1951 Ross Sept. 9, 1952 Mankin Nov. 3, 1953 Olson et a1. Nov. 9,1954 FOREIGN PATENTS Great Britain Mar. 17, 1885

